Modular multi-level converter based HVDC system for grid connection of offshore wind power plant

Gnanarathna, U.N.; Chaudhary, Sanjay K.; Gole, Aniruddha M.; Teodorescu, Remus

doi:10.1049/cp.2010.0984

Cited by 48 publications

(36 citation statements)

References 10 publications

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“…The proposed equivalent model was also used successfully to study large system such as connection of offshore wind power plants. This work was done in collaboration with Dr. S. K. Chaudhary and Dr. R. Teodorescu of Aalborg University and is reported in [95].…”

Section: Inverter Side Controllermentioning

confidence: 99%

Efficient Modeling of Modular Multilevel HVDC Converters (MMC) on Electromagnetic Transient Simulation Programs

Gnanarathna

Gole

Jayasinghe

2011

IEEE Trans. Power Delivery

681

306

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I AbstractThe recent introduction of a new converter topology, the modular multilevel converter (MMC) is a major step forward in voltage sourced converter (VSC) technology for high voltage, high power applications. To obtain a multilevel ac output waveform, a large number of semiconductor switches has to be used in the converter. The number of switches in the MMC for HVDC transmission is typically two orders of magnitudes larger than that in a two or three level VSC used in earlier generation. This large device count creates a computational challenge for electromagnetic transients (EMT) simulation programs, as it significantly increases the simulation time. The purpose of this research is to investigate whether the simulation can be speeded up. With the assumption of ideal switch operation and using an equivalent average capacitor value based approach, an average valued model of MMC is also proposed in this thesis. The average model can be accurately used in most of the system level studies.The control algorithms and other modeling aspects of MMC applications are also presented in this thesis. Abstract IIOne of the advantages of multilevel converters is the low operating losses as the smaller switching frequency of each individual power electronics switch and the low voltage step change during each switching. Using a recently developed, time domain simulation approach, the operating losses of the MMC converter are estimated in this thesis. When comparing the MMC operating losses against the losses of two-level VSC, the power loss for the two-level VSC is found to be significantly higher than the power loss of the MMC.

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Section: Inverter Side Controllermentioning

confidence: 99%

Efficient Modeling of Modular Multilevel HVDC Converters (MMC) on Electromagnetic Transient Simulation Programs

Gnanarathna

Gole

Jayasinghe

2011

IEEE Trans. Power Delivery

681

306

View full text Add to dashboard Cite

show abstract

“…However, their applications were restricted to a 400MW rating because of high switching losses caused by the use of pulse width modulation technique [12].…”

Section: Introductionmentioning

confidence: 99%

“…MMC ensures a high quality voltage waveform from switching a number of voltage levels producing a smooth step -like output [13]. The introduction of MMCs has enabled the increase of converter station efficiency [12]. This topology also allows for lower switching frequency [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…The introduction of MMCs has enabled the increase of converter station efficiency [12]. This topology also allows for lower switching frequency [12,13]. The advantages of MMCs are derived from their modular structure which enables higher voltages from several modules [14], removing the need for switches to be connected in series [12].…”

Section: Introductionmentioning

confidence: 99%

“…This topology also allows for lower switching frequency [12,13]. The advantages of MMCs are derived from their modular structure which enables higher voltages from several modules [14], removing the need for switches to be connected in series [12]. MMC stations in a VSC based transmission system possess stronger capacitive features than conventional VSC stations [15].…”

Section: Introductionmentioning

confidence: 99%

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